This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 405 |
| 4 | 8505 |
| 5 | 229635 |
| 6 | 7577955 |
| 7 | 295540245 |
| 8 | 13299311025 |
| 9 | 678264862275 |
| 10 | 38661097149675 |
| 11 | 2435649120429525 |
| 12 | 168059789309637225 |
| 13 | 12604484198222791875 |
| 14 | 1020963220056046141875 |
| 15 | 88823800144876014343125 |
| 16 | 8260613413473469333910625 |
| 17 | 817800727933873464057151875 |